Adapted to synthdef2 format. synthdef1 format no longer supported!
Actually activate shaders
video support: cmake: add detection for LibAvCodec
model loading: minor tweaks. still not working.
Texture pool: convert image files to GL format with QT
Add GFBTexQuad (a quad with the texture of a past frame)
GServer: don't create default group (already created by SCGraph itself)
in/out ugens: fix warning (size_t can't be negative)
FrameRate: UGen to report current fps added
Refactored texture pool to enable replacement of textures
FrameRate: add SC class
Added basic support to display text

- stringpool to handle strings
- osc commands to put strings in the string pool and change them
- GText ugen to display text with FTGL
Text support: Add /setFont for dynamic font changes.

- remove hardcoded font path
Text support: Add helpfile
Text support: Clean up CMakeLists.txt
Text support: Rescale font size to fit with display unit
Text support: Add helpfile
Renderer: Toggle fullscreen also on doubleclick and leave it with Escape.
Implement Buffer commands to handle textures

- Texturepool: revert to old (working) conversion method for gl texture format
- remove loadTexture* commands
- add support for /b_read, /b_allocRead, /b_set[n], /b_fill, /b_query, /b_zero
  num frames = width, num channels = height
  colors are represented as one Int32
- add .asInt method to Color to convert a color to an Int32
Basic, very experimental video support.

- add frame argument to GTexQuad
- refactor texture pool/texture loading
- add some BufInfoUGens (BufFrames, BufFrameRate)
- use KDE-project's way of finding FFMpeg